JP2023172620A - Lens barrel and imaging apparatus - Google Patents

Abstract

To provide a lens barrel that can suppress an increase in size while including a lock mechanism for a retracted state and a lens retreating mechanism.SOLUTION: A lens barrel can transition between an imaging state where imaging is enabled and a retracted state where imaging is restricted. The lens barrel comprises: a moving portion that moves a first optical member included in an optical system between an imaging position located on an optical axis of the optical system and a retreat position retreated from the optical axis; a base member that movably supports the moving portion; a cylindrical member disposed on the outer periphery of the base member; and an operating member that, when operated, relatively moves the cylindrical member and the base member. The cylindrical member includes a sliding surface on which the moving portion slides and an engagement portion that engages with the moving portion. The moving portion moves the first optical member from the imaging position to the retreat position by sliding on the sliding surface when the lens barrel transitions from the imaging state to the retracted state, and is engaged with the engagement portion and restricted from moving when the lens barrel is in the retracted state, the moving portion.SELECTED DRAWING: Figure 8

Description

The present invention relates to a lens barrel and an imaging device.

Conventionally, in order to shorten the overall length in the optical axis direction, a lens barrel has been proposed that is equipped with a collapsible mechanism that narrows the distance between lens groups when transitioning from a photographic state in which photography is possible to a collapsible state in which photography is restricted. . Patent Document 1 discloses a locking mechanism for restricting unintentional switching between a shooting state and a collapsing state.

Further, Patent Document 2 discloses a lens retraction mechanism that retracts a lens group in a direction perpendicular to the optical axis in order to further shorten the overall length in the optical axis direction.

Japanese Patent Application Publication No. 2010-286789 Japanese Patent Application Publication No. 2015-135472

If the locking mechanism of Patent Document 1 and the lens retracting mechanism of Patent Document 2 are mounted on a lens barrel that is manually retracted, the lens barrel will become large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel that is equipped with a locking mechanism and a lens retracting mechanism when in a collapsible state, while also being able to suppress enlargement.

A lens barrel according to one aspect of the present invention is a lens barrel that can be switched between a photographing state in which photographing is possible and a collapsible state in which photographing is restricted, and the first optical member included in the optical system is A moving part that moves between a photographing position located on the optical axis of the system and a retreating position retracted from the optical axis, a base member that movably supports the moving part, and a cylindrical member disposed around the outer periphery of the base member. and an operation member that moves the cylinder member and the base member relative to each other when operated, and the cylinder member has a sliding surface on which the moving part slides and a locking part that locks the moving part. The moving part moves the first optical member from the photographing position to the retracted position by sliding on the sliding surface when the lens barrel is switched from the photographing state to the retracted state, and the moving part moves the first optical member from the photographing position to the retracted position when the lens barrel is switched from the photographing state to the retracted state. In some cases, it is characterized in that it is locked by a locking part and its movement is restricted.

According to the present invention, it is possible to provide a lens barrel that is equipped with a locking mechanism and a lens retraction mechanism when in a collapsible state, and which can suppress enlargement.

1 is a perspective view of an imaging device having a lens barrel according to an embodiment of the present invention. FIG. 2 is a block diagram of an imaging device. FIG. 3 is a cross-sectional view of a lens barrel. FIG. 3 is an exploded perspective view of the retracting mechanism and collapsing mechanism. FIG. 3 is a front view of the image blur correction device. FIG. 3 is a developed view showing a cam locus of a cam groove formed in a cam cylinder. FIG. 2 is a front view of a configuration including an image blur correction device and a linear guide tube. 8 is a cross-sectional view taken along line AA in FIG. 7. FIG. 8 is a sectional view taken along the line BB in FIG. 7. FIG. FIG. 3 is a cross-sectional view of the image blur correction device. It is a figure which shows the rotation operation torque by a retraction lever.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals are given to the same members, and duplicate explanations will be omitted.

FIG. 1 is a perspective view of an imaging device having a lens barrel according to an embodiment of the present invention. FIGS. 1A and 1B are perspective views seen from the front side (subject side) and the back side (imaging surface side), respectively. The imaging device includes a lens barrel 101 and a camera body 1 to which the lens barrel 101 is removably attached. In this embodiment, as shown in FIG. 1(a), the optical axis direction, which is the direction in which the optical axis of the imaging optical system included in the lens barrel 101 extends (direction along the optical axis), is the X-axis direction, Directions perpendicular to the X-axis direction are defined as the Z-axis direction (horizontal direction) and the Y-axis direction (vertical direction). In the following description, the Z-axis direction and the Y-axis direction are collectively referred to as the Z/Y-axis direction. Furthermore, the direction of rotation around the Z axis is defined as a pitch direction, and the direction of rotation around the Y axis is defined as a yaw direction. The pitch direction and the yaw direction (hereinafter also referred to collectively as the pitch/yaw direction) are directions of rotation around two axes, the Z axis and the Y axis, which are orthogonal to each other. Note that in this embodiment, the lens barrel 101 and the camera body 1 are constructed as separate bodies, but they may be constructed integrally.

On the left side of the camera body 1 when viewed from the front side (right side when viewed from the back side), a grip portion 2 for a user to grip the camera body 1 with his/her hand is provided. Further, a power operation section 3 is arranged on the top surface of the camera body 1. When the user turns on the power operation unit 3 when the camera body 1 is in a power off state, power supply is started, the camera body 1 is turned on, and computer programs such as focus group origin detection processing are executed. , the camera enters the shooting standby state. In this embodiment, even if the camera body 1 is in a power off state, when the lens barrel 101 is mechanically and electrically connected, power is started from the camera body 1 to the lens barrel 101, and the focus group The origin detection process is executed. When the user operates the power operation section 3 to turn off the camera body 1 when the power is on, the camera body 1 is turned off.

Furthermore, a mode dial 4, a release button 5, and an accessory shoe 6 are provided on the top surface of the camera body 1. The user can switch the shooting mode by rotating the mode dial 4. The shooting modes include a manual still image shooting mode that allows the user to set shooting conditions such as shutter speed and aperture value, an automatic still image shooting mode that automatically obtains the appropriate exposure, and a mode for shooting videos. Includes video shooting modes. Further, by pressing the release button 5 halfway, the user can instruct photographing preparation operations such as autofocus and automatic exposure control, and by pressing the release button 5 fully, the user can instruct photographing. The accessory shoe 6 is removably attached to a lighting or light emitting device accessory (camera accessory) such as an external flash.

The lens barrel 101 includes a lens mount 102 that can be mechanically and electrically connected to the camera mount 7 provided on the camera body 1, and an imaging optical system that forms a subject image. A zoom operation ring (operation member) 103 is provided on the outer periphery of the lens barrel 101 and is rotatable about the optical axis by a user's operation. When the user operates the zoom operation ring 103, the zoom group forming the imaging optical system moves to a position corresponding to the angle of the zoom operation ring 103 in a range from the wide-angle end to the telephoto end. This allows the user to take pictures at a desired angle of view. When the zoom group is located in the range from the wide-angle end to the telephoto end, the lens barrel 101 is in a shooting state in which shooting is possible. Further, if the zoom operation ring 103 is further operated after the zoom group reaches the wide-angle end from the telephoto end, the zoom group reaches the collapsing end where photographing is restricted. When the zoom group is located at the collapsible end, the lens barrel 101 accommodates the imaging optical system and is in a collapsible state (non-photographing state) in which the overall length in the optical axis direction is shortest. Note that "imaging is restricted" means that some functions of the imaging device do not operate normally. For example, if the lens barrel is in a retracted state, it is possible to photograph the subject, but there is a possibility that at least a portion of the photographed image will be blurred due to events such as being out of focus. There is.

On the back of the camera body 1, a back operation section 8 and a display section 9 are provided. The rear operation unit 8 includes a plurality of buttons and dials to which various functions are assigned. When the camera body 1 is in a power-on state and a still image or video shooting mode is set, the display unit 9 displays a through image of a subject image being imaged by an image sensor, which will be described later. Further, the display unit 9 displays photographing parameters indicating photographing conditions such as shutter speed and aperture value. At this time, the user can change the setting values of the photographing parameters by operating the rear operation section 8 while looking at the display displayed on the display section 9. The rear operation section 8 includes a playback button for instructing playback of recorded photographic images, and when the user operates the playback button, the photographic images are reproduced and displayed on the display section 9. Note that the display section 9 may be configured to have a touch panel type and have the same functions as the rear operation section 8.

FIG. 2 is a block diagram showing the electrical and optical configuration of the imaging device. The camera body 1 includes a power supply section 10 that supplies power to the camera body 1 and the lens barrel 101, a power operation section 3, a mode dial 4, a release button 5, a rear operation section 8, and a touch panel function of a display section 9. It has an operation section 11. The camera body 1 also includes a camera control section 12, a shutter unit 14, a shutter drive section 15, an image sensor 16, an image processing section 17, and a focus detection section 18. In this embodiment, control of the entire imaging device is performed by cooperation between the camera control section 12 and the lens control section 104 provided in the lens barrel 101.

The camera control unit 12 reads and executes a computer program stored in the storage unit 13. At this time, the camera control section 12 communicates various control signals, data, etc. with the lens control section 104 via a communication terminal of an electric contact 105 provided on the lens mount 102. Electrical contact 105 includes a power terminal that supplies power from power supply unit 10 to lens barrel 101 .

The shutter unit 14 controls the amount of exposure to the image sensor 16. The image sensor 16 photoelectrically converts a subject image formed by the imaging optical system and outputs an image signal. The image processing unit 17 performs various image processing on the imaging signal and then generates an image signal. The display unit 9 displays the image signal (through image) output from the image processing unit 17, displays photographing parameters, and plays back and displays photographed images recorded in the storage unit 13 or a recording medium (not shown). or

The imaging optical system included in the lens barrel 101 includes a zoom group 110 that is connected to a zoom operation ring 103 and moves in the optical axis direction to change the angle of view, and a shift lens (first optical member) 601 that will be described later. A lens anti-vibration group (image blur correction group) 112 is provided. The lens image stabilization group 112 reduces image blur by moving (shifting) in the Z/Y axis direction perpendicular to the optical axis. The imaging optical system also includes an aperture group 301 that performs a light amount adjustment operation, and a focus group 114 that includes a focus lens that moves in the optical axis direction and performs focus adjustment. Further, the lens barrel 101 includes an anti-vibration drive unit 201 that moves the lens anti-vibration group 112, an aperture drive unit 302 that moves the aperture group 301, and a focus drive unit 401 that moves the focus group 114.

The camera control unit 12 controls the focus drive unit 401 in response to a shooting preparation operation on the operation unit 11 (such as a half-press operation of the release button 5). For example, when an autofocus operation is instructed, the focus detection unit 18 determines the focus state of the subject image on the imaging surface of the image sensor 16 based on the image signal generated by the image processing unit 17, and A signal is generated and transmitted to the camera control section 12. Further, the focus drive unit 401 transmits information regarding the current position of the focus group 114 to the camera control unit 12. The camera control unit 12 compares the focus state of the subject image and the current position of the focus group 114, calculates a focus drive amount from the amount of deviation, and transmits the amount to the lens control unit 104. The lens control unit 104 moves the focus group 114 to a target position in the optical axis direction via the focus drive unit 401 to correct the defocus of the subject image.

The focus drive unit 401 includes a focus motor that functions as an actuator and a photo interrupter that detects the origin position of the focus group 114. In this embodiment, a stepping motor is used as the focus motor.

Note that a DC motor equipped with an encoder, an ultrasonic motor, a servo motor, or the like may be used as the focus motor. Further, instead of the photo interrupter, the origin position of the focus group 114 may be detected using a photo reflector or a brush that contacts a conductive pattern to electrically detect a signal.

Further, the camera control section 12 controls the aperture group 301 and the shutter unit 14 via the aperture drive section 302 and the shutter drive section 15 according to the set values of the aperture value and shutter speed received from the operation section 11 . For example, when an automatic exposure control operation is instructed, the camera control section 12 receives a luminance signal generated by the image processing section 17 and performs photometry calculation. The camera control unit 12 controls the diaphragm drive unit 302 based on the result of the photometry calculation in response to a shooting instruction operation on the operation unit 11 (such as a full-press operation of the release button 5). Further, the camera control section 12 controls the shutter unit 14 via the shutter drive section 15 and performs exposure processing using the image sensor 16.

The camera body 1 includes a pitch shake detection section 19 and a yaw shake detection section 20. The pitch shake detection section 19 and the yaw shake detection section 20 each use an angular velocity sensor (vibration gyro) or an angular acceleration sensor to detect image shake in the pitch direction and the yaw direction and output shake signals.

The camera control unit 12 uses the shake signal from the pitch shake detection unit 19 to calculate the shift position of the lens image stabilization group 112 in the Y-axis direction. Further, the camera control unit 12 uses the shake signal from the yaw shake detection unit 20 to calculate the shift position of the lens vibration isolation group 112 in the Z-axis direction. Then, the camera control unit 12 moves the lens anti-vibration group 112 to the target position in the Z/Y-axis direction via the anti-vibration drive unit 201 according to the calculated shift position in the pitch/yaw direction. Reduce image blur during through-image display.

The lens barrel 101 includes a zoom detection unit 106 that detects the angle of a zoom operation ring 103 for changing the angle of view of the imaging optical system. The zoom detection unit 106 is configured using, for example, a resistance-type linear potentiometer, and detects the angle of the zoom operation ring 103 operated by the user as an absolute value. Information regarding the angle of view detected by the zoom detection unit 106 is transmitted to the lens control unit 104 and reflected in various controls by the camera control unit 12.

Hereinafter, with reference to FIG. 3, the positional relationship of the main components in the lens barrel 101 will be described. 3(a) to 3(c) are cross sections on the XY plane including the optical axis of the lens barrel 101 when the zoom group 110 is located at the wide-angle end, telephoto end, and collapsing end when not photographing, respectively. It is a diagram. Since the center line shown in FIG. 3 substantially coincides with the optical axis determined by the imaging optical system, it will be used as synonymous with the optical axis below.

In this embodiment, a six-group configuration is employed as an example of an imaging optical system. The zoom group 110 moves to different predetermined positions at the wide-angle end and the telephoto end, and forms an image of the subject on the imaging surface of the image sensor 16. The zoom group 110 includes a first lens group 111, a lens image stabilization group 112 that functions as a second lens group, an aperture group 301, a third lens group 113, a focus group 114 that functions as a fourth lens group, and a lens group 112 that functions as a second lens group. It is composed of a fifth lens group 115 and a sixth lens group 116. Note that the lens image stabilization group 112 and the focus group 114 may function as other zoom groups. Further, some of the lens groups may not be movable but may be fixed.

The linear guide tube (tube member) 107 is fixed to the lens mount 102 via a fixed tube (not shown). Cam grooves (not shown) are formed at equal positions on the outer peripheral surface of the linear guide cylinder 107. A cam follower (not shown) is provided on the inner peripheral surface of the cam cylinder 108. Further, the cam cylinder 108 is connected to the zoom operation ring 103 via a key (not shown). When the zoom operation ring 103 is operated, the cam cylinder 108 moves forward and backward along the optical axis direction while rotating around the optical axis due to the engagement between the cam groove and the cam follower.

In the linear guide tube 107, linear guide grooves 702 are formed at equal positions to restrict the movement of the zoom group 110 in the rotational direction and guide the linear movement in the optical axis direction. Further, in the cam barrel 108, a first cam groove 801 and a second cam groove 802, each having a locus of a different angle in the rotational direction, are formed at equal positions corresponding to the zoom group 110. Further, the zoom group 110 is provided with a plurality of cam followers, and each cam follower is fitted into a corresponding linear guide groove and cam groove. When the zoom operation ring 103 is operated, the cam barrel 108 rotates, and due to the engagement between the linear guide groove of the cam follower and the cam groove, the zoom group 110 is restricted from moving in the rotational direction, but moves along the optical axis direction. advance and retreat.

In this embodiment, the lens barrel 101 has a collapsing mechanism that narrows the distance between the lens groups, and a retraction mechanism for the lens image stabilization group 112. This allows the zoom group 110 to be retracted to the back side (imaging surface side) when not photographing, so the overall length of the lens barrel 101 can be shortened and the portability of the imaging device can be increased. When the zoom operation ring 103 is operated and the lens barrel 101 changes from the state shown in FIG. 3(c) to the state shown in FIG. It becomes possible to take pictures.

Furthermore, in the states of FIGS. 3(a) and 3(b), all lens groups are arranged on the same optical axis, but in the state of FIG. 3(c), the lens vibration isolation group 112 It is retracted in a direction perpendicular to the axis (radial direction). When the user operates the zoom operation ring 103 so that the lens barrel 101 changes from the state shown in FIG. 3(b) to the state shown in FIG. 3(c), the zoom group 110 retracts to the back side (imaging surface side). At the same time, the lens image stabilization group 112 retreats from the optical axis. The first lens group (second optical member) 111 is further retracted into the space created by the retraction of the lens anti-vibration group 112, and is housed so as not to interfere with each other, as shown in FIG. 3(c). The total length is the shortest as shown in .

In this embodiment, the operation of the zoom operation ring 103 when moving the zoom group 110 from the telephoto end side to the collapsible end side is referred to as the operation of the zoom operation ring 103 toward the collapsible side. Furthermore, the operation of the zoom operation ring 103 when moving the zoom group 110 from the collapsible end side to the telephoto end side is referred to as an operation of the zoom operation ring 103 toward the photographing side.

Hereinafter, with reference to FIGS. 4 and 5, the configuration of an image blur correction device 600 that is included in the lens image stabilization group 112 of this embodiment and has a retraction mechanism will be described. FIG. 4 is an exploded perspective view of the retracting mechanism and collapsing mechanism. FIGS. 5A and 5B are front views of the image blur correction device 600 in a shooting state in which shooting is possible and in a retracted state in which shooting is restricted, respectively.

The image stabilization device 600 includes a shift lens 601, a lens frame (first holding part) 602, a base member 603, a shift member 604, a holder torsion spring (biasing part) 606, a retraction lever (driving member) 607, and a lever. A torsion spring 609 (biasing portion) is provided.

Lens frame 602 holds shift lens 601. Further, the lens frame 602 is formed with a stopper portion 602a, a sleeve 602b parallel to the optical axis, a first retraction contact surface (first contact surface) 602c, and an interference avoidance space 602d during vibration isolation. The lens frame 602, together with the retractable lens 607, functions as a moving unit that moves the shift lens 601 between a photographing position located on the optical axis and a retracted position retracted from the optical axis.

A bearing 604a that supports the holder shaft 605, three ball receiving surfaces (not shown) that abut the three balls 610, and first ends of each of the three thrust springs 611 are hooked to the shift member 604. Three spring hooks 604b are formed. Further, the shift member 604 is provided with a pair of magnets 613 that are spaced apart from each other by 90° in the circumferential direction in a plane perpendicular to the optical axis, and a contact portion 604c that is in contact with the stopper portion 602a.

The holder shaft 605 is fitted into the sleeve 602b in parallel to the optical axis. The lens frame 602 is rotatably supported by a bearing 604a via a holder shaft 605 between a photographing position and a retracted position, and moves integrally with a shift member 604 in a plane perpendicular to the optical axis during image blur correction. do.

The holder torsion spring 606 includes a torsion spring part and a compression spring part, and is fitted onto the sleeve 602b. The torsion spring portion of the holder torsion spring 606 urges the lens frame 602 against the shift member 604 so that the stopper portion 602a contacts the contact portion 604c. That is, the torsion spring section biases the lens frame 602 in a direction to move it from the retracted position to the photographing position. Further, the compression spring portion of the holder torsion spring 606 biases the lens frame 602, and brings the tip of the sleeve 602b into contact with the bearing 604a.

The base member 603 is formed with a ball groove 603b and three spring hooks to which second ends of the three thrust springs 611 are hooked. Due to the biasing force of the thrust spring 611, the three balls 610 are held between the ball receiving surface of the shift member 604 and the ball groove 603b, and are housed so as to be able to roll in a plane perpendicular to the optical axis. . The base member 603 is also provided with a bearing 603a that pivotally supports the lever shaft 608 in parallel to the optical axis, and a photographing position contact surface 603d with which the retraction lever 607 comes into contact. Furthermore, a pair of coils 614 are arranged on the base member 603 and are arranged in the same phase as the pair of magnets 613 . When the pair of coils 614 is energized, a Lorentz force is generated between the pair of coils 614 and the magnetism of the pair of magnets 613. The generated Lorentz force supports the shift member 604 so that it can move in parallel with the base member 603 in a plane perpendicular to the optical axis.

A pair of Hall elements 616 are mounted on the flexible substrate 615. The pair of Hall elements 616 are arranged at positions facing the pair of magnets 613 in the optical axis direction, and are fixed to the base member 603. The Hall element 616 detects changes in the direction and magnitude of the magnetic force of the pair of magnets 613, and the lens control unit 104 determines the position of the shift member 604 with respect to the Hall element 616 based on the detection result by the Hall element 616. At this time, the lens control unit 104 controls the voltage applied to the pair of coils 614 based on image blur information from a gyro sensor (not shown) provided in the camera body 1 or the lens barrel 101, and The shift member 604 is moved within the plane. In this way, by moving the lens frame 602 in the direction in which image blur is corrected, image blur caused by vibrations such as camera shake in the subject image on the imaging surface of the image sensor 16 is corrected, and an image free from image blur is created. and images can be obtained.

The retraction lever 607 is provided with a fitting hole 607a that fits into the lever shaft 608, and a retraction abutment portion 607b that abuts the first retraction abutment surface 602c. The retraction lever 607 is rotatably supported by a bearing 603a around a lever shaft 608. The retraction lever 607 is urged toward the photographing position by a lever torsion spring 609 attached around the lever shaft 608 so as to come into contact with the photographing position abutting surface 603d.

On the outer periphery of the base member 603, second group followers 603e are provided at three locations at approximately equal intervals in the circumferential direction. Each of the three second group followers 603e engages with a corresponding one of the three second cam grooves 802 formed in the inner circumference of the cam cylinder 108, and is guided by the linear guide groove 702 of the linear guide cylinder 107. Ru. Thereby, the base member 603 is supported so as to be movable toward and away from the cam barrel 108 and the linear guide barrel 107 along the optical axis direction. As a result, the image blur correction device 600 is supported so as to be movable back and forth along the optical axis direction.

FIG. 6 is a developed view showing cam trajectories of the first cam groove 801 and the second cam groove 802 formed in the cam cylinder 108.

As described above, the second group follower 603e engages with the second cam groove 802. Further, a first group follower (not shown) is formed on the outer circumference of the lens frame (second holding portion) 111a that holds the first lens group 111. The first group follower engages with the first cam groove 801 and moves forward and backward along the trajectory of the first cam groove 801 in the optical axis direction.

The first cam groove 801 has a photographing region 801a from the telephoto end to the wide-angle end, and a collapsible region (non-photographing region) from the wide-angle end to the collapsible end. The collapsible barrel region includes a first collapsible barrel region 801b and a second barrel collapsible region 801c. Further, the second cam groove 802 has a photographing area 802a from the telephoto end to the wide-angle end, and a collapsible region from the wide-angle end to the collapsible end. The collapsible barrel region includes a first collapsible barrel region 802b and a second barrel collapsible region 802c.

The operation of the image blur correction device 600 when the lens barrel 101 changes from the photographing state to the retracted state will be described below.

FIG. 7 is a front view of a configuration including the image blur correction device 600 and the linear guide tube 107. FIG. 8 is a cross-sectional view taken along the line AA in FIG. 7, showing the relationship between the linear guide tube 107 and the retraction lever 607. FIG. 8A is a cross-sectional view when the zoom group 110 is located at a position other than the wide-angle end within the range from the wide-angle end to the telephoto end. FIG. 8(b) is a cross-sectional view when the zoom group 110 is positioned at the wide-angle end. FIGS. 8(c) and 8(d) are cross-sectional views when the zoom group 110 is located between the wide-angle end and the collapsible end. FIG. 8(e) is a cross-sectional view when the zoom group 110 is located at the collapsible end. In addition, in FIG. 8, the upper side in the figure is the front side (subject side). FIG. 9 is a sectional view taken along the line BB in FIG. 7 when the zoom group 110 is located at the wide-angle end. FIG. 10 is a cross-sectional view of the image blur correction device 600. 10(a) and 10(b) are cross-sectional views when the lens frame 602 is located at the first retracted position and the second retracted position, respectively. FIG. 11 is a diagram showing the rotational operation torque of the retraction lever 607.

As shown in FIG. 7, the linear guide tube 107 includes a sliding surface 700 on which the retraction lever 607 slides. As shown in FIG. 8, the sliding surface 700 includes a first sliding surface 700a, a second sliding surface 700b, a third sliding surface (parallel surface) 700c, and a locking portion 701. Further, the retraction lever 607 includes a first sliding portion 607c, a second sliding portion 607d, a third sliding portion 607e, and a locking portion 607f.

In the state of FIG. 8(a), the shift lens 601 is located on the optical axis. At this time, the first sliding part 607c, the second sliding part 607d, and the third sliding part 607e are arranged at positions where they do not come into contact with the sliding surface 700, and the retraction lever 607 does not rotate. Further, as shown in FIG. 5(a), the retraction lever 607 is supported such that the retraction abutting portion 607b is located in the vibration isolation interference avoidance space 602d where the retraction contact portion 607b does not contact the first retraction contact surface 602c. . Thereby, during image blur correction, the lens frame 602 can be moved in parallel with the shift member 604 in a plane perpendicular to the optical axis.

In the state shown in FIG. 8B, the first sliding portion 607c and the first sliding surface 700a are in contact with each other, and the rotation of the zoom operation ring 103 is locked. A first abutting portion 603f is provided on the outer peripheral portion of the base member 603. The first abutment part 603f is arranged in the same phase as the retraction lever 607 and on the back side (imaging surface side) of the second group follower 603e. Further, a second abutting portion 603g is provided on the outer peripheral portion of the base member 603. The second abutment section 603g is arranged in a phase opposite to the retraction lever 607 with respect to the optical axis, and at least a portion thereof is arranged closer to the subject than the second group follower 603e. A first abutment surface 703 and a second abutment surface 704 are provided on the inner peripheral surface side of the linear guide cylinder 107 . When the second group follower 603e is located closest to the wide-angle end in the photographing area 802a, the first abutment part 603f and the first abutment surface 703, and the second abutment part 603g and the second abutment surface 704 face each other. placed in position. As a result, when rotational force is generated in the entire base member 603 due to contact between the first sliding portion 607c and the first sliding surface 700a, displacement in the rotational direction is restricted, and the impact on the second cam groove 802 is reduced. be done.

The retraction lever 607 is biased by a lever torsion spring 609 using a lever shaft 608 as a rotation axis. The first sliding portion 607c is biased in the circumferential direction of the linear guide cylinder 107 (in the direction of arrow C in FIG. 8). Further, the first sliding surface 700a is inclined at an angle θ1 with respect to the optical axis. Therefore, when the first sliding portion 607c is pressed against the first sliding surface 700a, the first sliding portion 607c receives a reaction force from the first sliding surface 700a in a direction against the lever torsion spring 609. . When the zoom group 110 moves from the wide-angle end to the collapsed end, the reaction force from the first sliding surface 700a increases, and the retraction lever 607 resists the urging force of the lever torsion spring 609 and moves around the lever shaft 608. Start rotating. Thereafter, as shown in FIG. 8(c), the second sliding portion 607d and the second sliding surface 700b come into contact. The second sliding surface 700b is inclined at an angle θ2 smaller than the angle θ1 with respect to the optical axis. Therefore, when the zoom group 110 is retracted to the rear side (imaging surface side), the component force in the slope direction (sliding direction) on the second sliding surface 700b is smaller than the component force in the slope direction on the first sliding surface 700a. also becomes larger. That is, the force required to slide the second sliding portion 607d onto the second sliding surface 700b is smaller than the force required to slide the first sliding portion 607c onto the first sliding surface 700a. It's okay. As a result, when the zoom group 110 moves from the wide-angle end to the collapsible end, the first sliding portion 607c slides on the second sliding surface 700a, and the second sliding portion 607d slides on the second sliding surface 700b. A click feeling occurs due to the difference in operating force between the sliding state and the sliding state (see FIG. 11). In this embodiment, by changing the angle between the first sliding surface 700a and the second sliding surface 700b and the biasing force of the lever torsion spring 609, it is possible to set a click feeling suitable for operating the zoom operation ring 103. can. The set click feeling allows the user to recognize the phase boundary of the zoom operation ring 103.

When the second sliding portion 607d slides on the second sliding surface 700b toward the back side (towards the imaging surface) and the retracting lever 607 rotates, the retracting abutting portion 607b abuts the first retracting abutting surface 602c. When the second sliding portion 607d further moves toward the back side (towards the imaging surface), the rotation of the retraction lever 607 causes the lens frame 602 to move out of the optical axis against the biasing force of the holder torsion spring 606.

As shown in FIG. 8(d), when the third sliding portion 607e contacts the third sliding surface 700c, the lens frame 602 is located at the first retracted position shown in FIG. 10(a). The third sliding surface 700c is parallel to the optical axis, and the retraction lever 607 does not rotate while the third sliding portion 607e is in contact with the third sliding surface 700c. Note that "parallel to the optical axis" includes not only the case of being strictly parallel to the optical axis but also the case of being substantially parallel (substantially parallel) to the optical axis. The first group follower engages with a cam groove in the second collapsible region 801c, and the first lens group 111 approaches the image blur correction device 600 in response to the operation of the zoom operation ring 103 toward the collapsible side. Then, a part of the first zoom group 110 enters the space created by the retraction of the lens frame 602. Since the lens frame 602 is located at the first retracted position, it does not come into contact with a part of the first lens group 111 that has entered the space.

As shown in FIG. 8E, when the zoom operation ring 103 is operated until the zoom group 110 reaches the collapsed position, the locking portion 607f slides into the locking portion 701. Thereby, it is possible to lock the storage state in the non-photographing state as shown in FIG. 5(b). At this time, the lens frame 602 is located at the second retracted position. The locking portion 701 is formed in a concave shape on an extension of the third sliding surface 700c. Therefore, when the locking portion 607f is fitted into the locking portion 701, the retraction lever 607 is rotated toward the photographing position by the biasing force of the lever torsion spring 609. Accordingly, the lens frame 602 also rotates toward the photographing position due to the biasing force of the holder torsion spring 606. That is, the second retracted position is closer to the photographing position (on the optical axis side) than the first retracted position. When the locking portion 701 has a convex shape, the lens frame 602 is retracted further outward from the first retraction position, but in this embodiment, since the locking portion 701 is a concave shape, the amount of retraction of the lens frame 602 is This can be minimized and the enlargement of the lens barrel 101 can be suppressed. In this embodiment, the second retraction contact surface (second contact surface) 602e contacts the lens frame contact portion 111b provided on the lens frame 111a, thereby preventing the rotation of the lens frame 602 toward the photographing position. The position where it is stopped is the second retracted position. At this time, the retraction contact portion 607b and the first retraction contact surface 602c are separated. The second retraction abutment surface 602e has a longer distance from the holder shaft 605, which is the center of rotation, than the first retraction abutment surface 602c. Therefore, the reaction force applied to the lens frame 602 in the retracted state is smaller than when rotation is stopped by the retraction lever 607. Thereby, it is possible to suppress the lens frame 602 from becoming larger and having a more complicated shape, which would otherwise occur in order to ensure rigidity as a countermeasure against creep.

When the lens barrel 101 changes from the retracted state to the shooting state, the retraction lever 607 changes from the state of FIG. 8(e) to the state of FIG. 8(d) and FIG. 8(c), and then to the state of FIG. 8(b). becomes. By changing the angle between the locking portion 607f and the locking portion 701 and the biasing force of the lever torsion spring 609, it is possible to set a lock release torque suitable for operating the zoom operation ring 103.

As described using FIG. 8A, when the lens barrel 101 is in the photographing state, no rotational operation torque is generated due to the sliding of the retraction lever 607. As explained using FIG. 8(b), since the inclination angle of the first sliding surface 700a with respect to the optical axis is large and the component force in the slope direction is small, the rotational operation torque becomes large at the wide-angle end. As explained using FIG. 8(c), since the inclination angle of the second sliding surface 700b with respect to the optical axis is small and the component force in the slope direction is large, the rotational operation torque is small. However, as the lens barrel 101 changes to the collapsed state, the retraction lever 607 rotates and the biasing forces of the lever torsion spring 609 and the holder torsion spring 606 increase, so the rotational operation torque gradually increases. At this time, the first group follower is engaged with the first collapsible region 801b. The first collapsible region 801b is formed such that the slope with respect to the optical axis increases toward the collapsible barrel side. That is, the rotational operation torque generated by the sliding of the retraction lever 607 during the collapsing operation becomes smaller toward the collapsible side. Thereby, the rotational operation torque can be brought close to a constant value. As explained using FIG. 8(d), since the third sliding surface 700d is formed parallel to the optical axis, the rotational operation torque is a constant value. At this time, the first group follower is engaged with the second collapsible region 801c. In the second collapsible region 801c, the inclination angle of the cam groove is constant, and the rotational operation torque generated by sliding of the retraction lever 607 is also a constant value. As described using FIG. 8(e), in the collapsed state, the retraction lever 607 is fitted into the locking portion 701, and further rotation is restricted. At this time, since the locking portion 701 has a concave shape, the retracting lever 607 fits into the locking portion 701 smoothly. As explained above, during the collapsing operation, the rotational operation torque increases only at the wide-angle end, making it easy for the user to recognize the shooting end and allowing the collapsing operation to be performed smoothly.

When the zoom operation ring 103 is operated so that the lens barrel 101 changes from the collapsing state to the photographing state, the phase in which a large rotational operation torque is generated is the collapsing end when the evacuation lever 607 escapes from the locking portion 702. Only. In other phases, no large rotational operation torque is generated. Further, the angles θ1 and θ2 and the biasing force of the lever torsion spring 609 are set so that the rotational operation torque becomes small when moving from the second sliding surface 700b to the first sliding surface 700a. As a result, the rotational operation torque becomes smaller in the imaging area, so that the user can recognize the boundary between the collapsible barrel area and the imaging area. Therefore, the user can smoothly operate the zoom operation ring 103 from the collapsible region to the photographing region without feeling uncomfortable.

Further, the rotational operation torque may be adjusted using a charge member (not shown). The charging member is disposed, for example, between the zoom operation ring 103 and a fixed barrel (not shown), and changes the amount of charge in accordance with the rotational phase of the zoom operation ring 103.

According to the configuration of the present embodiment, it is possible to realize the lens barrel 101 that is equipped with a locking mechanism and a lens retraction mechanism in the collapsible state and suppresses increase in size by using common parts. Note that the first sliding portion Although the second sliding portion 607c, the second sliding portion 607d, and the third sliding portion 607e are formed on a plane in this embodiment, they may be formed in a continuous arc shape. Further, the third sliding surface 700c may be inclined by an angle θ3 smaller than the angle θ2 with respect to the optical axis. Furthermore, the third sliding surface 700c may not be formed, and the second sliding surface 700b may be connected to the locking portion 701. In the collapsed state, the first sliding portion 607c and the locking portion 607f contact the locking portion 701, but only the locking portion 607f contacts the locking portion 701, restricting the rotation of the zoom operation ring 103 toward the collapsible barrel side. may be performed using other parts (for example, the zoom operation ring 103 and a fixed barrel (not shown)). The lens frame 602 does not need to be used for image stabilization. That is, the lens frame 602 may be held by the base member 603 via the holder shaft 605. Furthermore, the retraction lever 607 may be configured integrally with the lens frame 602.

The disclosure of this embodiment includes the following configurations.
(Configuration 1)
A lens barrel that can be switched between a shooting state in which photography is possible and a collapsible state in which photography is restricted,
a moving unit that moves a first optical member included in the optical system between a photographing position located on the optical axis of the optical system and a retracted position retracted from the optical axis;
a base member that movably supports the moving part;
a cylindrical member disposed around the outer periphery of the base member;
an operating member that relatively moves the cylindrical member and the base member when operated;
The cylindrical member includes a sliding surface on which the moving part slides, and a locking part that locks the moving part,
The moving part is
When the lens barrel switches from the photographing state to the collapsing state, moving the first optical member from the photographing position to the retracted position by sliding on the sliding surface,
When the lens barrel is in the collapsible state, the lens barrel is locked by the locking portion and movement is restricted.
(Configuration 2)
The moving section includes a first holding section that holds the first optical member, and a driving member that moves the first holding section by sliding on the sliding surface. 1. The lens barrel according to 1.
(Configuration 3)
3. The lens barrel according to configuration 1 or 2, wherein the locking portion is formed in a concave shape with respect to the sliding surface.
(Configuration 4)
The retracted position includes a first retracted position and a second retracted position closer to the optical axis than the first retracted position,
When the lens barrel is switched from the photographing state to the retracted state, the first optical member moves to the first retracted position, and then the moving part is locked by the locking part, so that the first optical member moves to the first retracted position. The lens barrel according to any one of configurations 1 to 3, characterized in that the lens barrel moves to the second retracted position.
(Configuration 5)
The sliding surface includes a parallel surface parallel to the optical axis,
4. The lens barrel according to configuration 4, wherein the first optical member is located at the first retracted position while the moving section slides on the parallel surface.
(Configuration 6)
According to configuration 4 or 5, further comprising a second holding part that holds the second optical member and enters a space created when the first optical member moves to the first retracted position. lens barrel.
(Configuration 7)
The moving section includes a first holding section that holds the first optical member, and a driving member that rotates the first holding section,
7. The lens barrel according to configuration 6, wherein when the first optical member is located at the second retracted position, the first holding section contacts the second holding section.
(Configuration 8)
The moving section includes a first holding section that holds the first optical member, and a driving member that rotates the first holding section,
The first holding portion includes a first contact surface that contacts the driving member when the first optical member is located at the first retracted position, and a first contact surface that contacts the driving member when the first optical member is located at the second retracted position. a second contact surface that comes into contact with the second holding part when the second holding part is located at the second holding part;
The distance between the second contact surface and the center of rotation of the first holding part is longer than the distance between the first contact surface and the center of rotation of the first holding part. The lens barrel according to configuration 6.
(Configuration 9)
The sliding surface includes a first sliding surface on which the moving section slides when the lens barrel switches from the photographing state to the collapsing state, and a first sliding surface on which the moving section slides. a second sliding surface that slides later;
The lens according to any one of configurations 1 to 8, wherein the angle of inclination of the first sliding surface with respect to the optical axis is larger than the angle of inclination of the second sliding surface with respect to the optical axis. lens barrel.
(Configuration 10)
a cam cylinder that rotates in response to an operation on the operating member;
further comprising a second holding part that holds a second optical member and enters a space created when the first optical member moves to the retracted position;
The cam cylinder includes a cam groove that engages with a follower provided in the second holding part,
The cam groove includes a cam with which the follower is engaged while the moving part slides on the second sliding surface, and whose slope with respect to the optical axis increases as the lens barrel moves toward the collapsed state. The lens barrel according to configuration 9, characterized in that:
(Configuration 11)
further comprising a lens group including the base member,
The lens group includes an integrally movable follower and a first abutment part that is in the same phase as the moving part and is provided closer to the imaging surface than the follower,
The cylindrical member includes a first abutment surface,
10. The lens barrel according to configuration 9, wherein when the moving part contacts the first sliding surface, the first abutment part faces the first abutment surface.
(Configuration 12)
further comprising a lens group including the base member,
The lens group includes a follower that is integrally movable, and a second aperture that is in a phase opposite to the moving part with respect to the optical axis and that is at least partially provided closer to the subject than the follower. Equipped with a
The cylindrical member includes a second abutment surface,
10. The lens barrel according to configuration 9, wherein when the moving part contacts the first sliding surface, the second abutment part faces the second abutment surface.
(Configuration 13)
13. The lens barrel according to any one of configurations 1 to 12, wherein the first optical member is included in an image blur correction group used to correct image blur.
(Configuration 14)
14. The lens barrel according to any one of configurations 1 to 13, further comprising a biasing portion that biases the moving portion toward the photographing position.
(Configuration 15)
The lens barrel according to any one of configurations 1 to 14,
An imaging device characterized by having an imaging element.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the invention.

101 Lens barrel 103 Zoom operation ring (operation member)
107 Direct guide tube (guide tube)
601 Shift lens (first optical member)
602 Lens frame (moving part)
603 Base member 607 Evacuation lever (moving part)
700a First sliding surface 700a Second sliding surface 700c Third sliding surface 701 Locking part

Claims (15)

A lens barrel that can be switched between a shooting state in which photography is possible and a collapsible state in which photography is restricted,
a moving unit that moves a first optical member included in the optical system between a photographing position located on the optical axis of the optical system and a retracted position retracted from the optical axis;
a base member that movably supports the moving part;
a cylindrical member disposed around the outer periphery of the base member;
an operating member that relatively moves the cylindrical member and the base member when operated;
The cylindrical member includes a sliding surface on which the moving part slides, and a locking part that locks the moving part,
The moving part is
When the lens barrel switches from the photographing state to the collapsing state, moving the first optical member from the photographing position to the retracted position by sliding on the sliding surface,
When the lens barrel is in the collapsible state, the lens barrel is locked by the locking portion and movement is restricted. The moving section includes a first holding section that holds the first optical member, and a driving member that moves the first holding section by sliding on the sliding surface. Item 1. The lens barrel according to item 1. 3. The lens barrel according to claim 1, wherein the locking portion is formed in a concave shape with respect to the sliding surface. The retracted position includes a first retracted position and a second retracted position closer to the optical axis than the first retracted position,
When the lens barrel is switched from the photographing state to the retracted state, the first optical member moves to the first retracted position, and then the moving part is locked by the locking part, so that the first optical member moves to the first retracted position. The lens barrel according to claim 1 or 2, wherein the lens barrel moves to a second retracted position. The sliding surface includes a parallel surface parallel to the optical axis,
The lens barrel according to claim 4, wherein the first optical member is located at the first retracted position while the moving section slides on the parallel surface. 5. The device according to claim 4, further comprising a second holding portion that holds the second optical member and enters a space created when the first optical member moves to the first retracted position. lens barrel. The moving section includes a first holding section that holds the first optical member, and a driving member that rotates the first holding section,
7. The lens barrel according to claim 6, wherein when the first optical member is located at the second retracted position, the first holding part contacts the second holding part. The moving section includes a first holding section that holds the first optical member, and a driving member that rotates the first holding section,
The first holding portion includes a first contact surface that contacts the driving member when the first optical member is located at the first retracted position, and a first contact surface that contacts the driving member when the first optical member is located at the second retracted position. a second contact surface that comes into contact with the second holding part when the second holding part is located at the second holding part;
The distance between the second contact surface and the center of rotation of the first holding part is longer than the distance between the first contact surface and the center of rotation of the first holding part. The lens barrel according to claim 6. The sliding surface includes a first sliding surface on which the moving section slides when the lens barrel switches from the photographing state to the collapsing state, and a first sliding surface on which the moving section slides. a second sliding surface that slides later;
3. The lens barrel according to claim 1, wherein the angle of inclination of the first sliding surface with respect to the optical axis is larger than the angle of inclination of the second sliding surface with respect to the optical axis. a cam cylinder that rotates in response to an operation on the operating member;
further comprising a second holding part that holds a second optical member and enters a space created when the first optical member moves to the retracted position;
The cam cylinder includes a cam groove that engages with a follower provided in the second holding part,
The cam groove includes a cam with which the follower is engaged while the moving part slides on the second sliding surface, and whose slope with respect to the optical axis increases as the lens barrel moves toward the collapsed state. The lens barrel according to claim 9, characterized in that: further comprising a lens group including the base member,
The lens group includes an integrally movable follower and a first abutment part that is in the same phase as the moving part and is provided closer to the imaging surface than the follower,
The cylindrical member includes a first abutment surface,
The lens barrel according to claim 9, wherein when the moving part contacts the first sliding surface, the first abutment part faces the first abutment surface. further comprising a lens group including the base member,
The lens group includes a follower that is integrally movable, and a second aperture that is in a phase opposite to the moving part with respect to the optical axis and that is at least partially provided closer to the subject than the follower. Equipped with a
The cylindrical member includes a second abutment surface,
10. The lens barrel according to claim 9, wherein when the moving part contacts the first sliding surface, the second abutment part faces the second abutment surface. 3. The lens barrel according to claim 1, wherein the first optical member is included in an image blur correction group used to correct image blur. 3. The lens barrel according to claim 1, further comprising a biasing part that biases the moving part toward the photographing position. The lens barrel according to claim 1 or 2,
An imaging device characterized by having an imaging element.